/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.opengrok.suggest.query.customized;

import org.apache.lucene.util.PriorityQueue;

/**
 * Copy of the Lucene's {@link org.apache.lucene.search.PhraseQueue}. It is needed by
 * {@link CustomExactPhraseScorer} and {@link CustomSloppyPhraseScorer} and has package private access.
 */
final class PhraseQueue extends PriorityQueue<PhrasePositions> {

    PhraseQueue(int size) {
        super(size);
    }

    @Override
    protected boolean lessThan(PhrasePositions pp1, PhrasePositions pp2) {
        if (pp1.position == pp2.position) {
            // same doc and pp.position, so decide by actual term positions.
            // rely on: pp.position == tp.position - offset.
            if (pp1.offset == pp2.offset) {
                return pp1.ord < pp2.ord;
            } else {
                return pp1.offset < pp2.offset;
            }
        } else {
            return pp1.position < pp2.position;
        }
    }
}
